freebsd-dev/lib/libpthread/thread/thr_sigwait.c
Daniel Eischen e62165c8b0 Add compatibility symbol maps. libpthread (.so.1 and .so.2)
used LIBTHREAD_1_0 as its version definition, but now needs
to define its symbols in the same namespace used by libc.
The compatibility hooks allows you to use libraries and
binaries built and linked to libpthread before libc was
built with symbol versioning.  The shims can be removed if
libpthread is given a version bump.

Reviewed by:	davidxu
2006-03-13 00:59:51 +00:00

213 lines
5.7 KiB
C

//depot/projects/kse/lib/libpthread/thread/thr_sigwait.c#1 - branch change 15154 (text+ko)
/*
* Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <signal.h>
#include <sys/param.h>
#include <sys/signalvar.h>
#include <errno.h>
#include <pthread.h>
#include "thr_private.h"
LT10_COMPAT_PRIVATE(__sigwait);
LT10_COMPAT_PRIVATE(_sigwait);
LT10_COMPAT_DEFAULT(sigwait);
LT10_COMPAT_PRIVATE(__sigtimedwait);
LT10_COMPAT_PRIVATE(_sigtimedwait);
LT10_COMPAT_DEFAULT(sigtimedwait);
LT10_COMPAT_PRIVATE(__sigwaitinfo);
LT10_COMPAT_PRIVATE(_sigwaitinfo);
LT10_COMPAT_DEFAULT(sigwaitinfo);
__weak_reference(__sigwait, sigwait);
__weak_reference(__sigtimedwait, sigtimedwait);
__weak_reference(__sigwaitinfo, sigwaitinfo);
static int
lib_sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout)
{
struct pthread *curthread = _get_curthread();
int ret = 0;
int i;
struct sigwait_data waitdata;
sigset_t waitset;
kse_critical_t crit;
siginfo_t siginfo;
if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
if (info == NULL)
info = &siginfo;
return (__sys_sigtimedwait((sigset_t *)set, info,
(struct timespec *)timeout));
}
/*
* Initialize the set of signals that will be waited on:
*/
waitset = *set;
/* These signals can't be waited on. */
SIGDELSET(waitset, SIGKILL);
SIGDELSET(waitset, SIGSTOP);
/*
* POSIX says that the _application_ must explicitly install
* a dummy handler for signals that are SIG_IGN in order
* to sigwait on them. Note that SIG_IGN signals are left in
* the mask because a subsequent sigaction could enable an
* ignored signal.
*/
crit = _kse_critical_enter();
KSE_SCHED_LOCK(curthread->kse, curthread->kseg);
for (i = 1; i <= _SIG_MAXSIG; ++i) {
if (SIGISMEMBER(waitset, i) &&
SIGISMEMBER(curthread->sigpend, i)) {
SIGDELSET(curthread->sigpend, i);
siginfo = curthread->siginfo[i - 1];
KSE_SCHED_UNLOCK(curthread->kse,
curthread->kseg);
_kse_critical_leave(crit);
ret = i;
goto OUT;
}
}
curthread->timeout = 0;
curthread->interrupted = 0;
_thr_set_timeout(timeout);
/* Wait for a signal: */
siginfo.si_signo = 0;
waitdata.waitset = &waitset;
waitdata.siginfo = &siginfo;
curthread->data.sigwait = &waitdata;
THR_SET_STATE(curthread, PS_SIGWAIT);
_thr_sched_switch_unlocked(curthread);
/*
* Return the signal number to the caller:
*/
if (siginfo.si_signo > 0) {
ret = siginfo.si_signo;
} else {
if (curthread->interrupted)
errno = EINTR;
else if (curthread->timeout)
errno = EAGAIN;
ret = -1;
}
curthread->timeout = 0;
curthread->interrupted = 0;
/*
* Probably unnecessary, but since it's in a union struct
* we don't know how it could be used in the future.
*/
curthread->data.sigwait = NULL;
OUT:
if (ret > 0 && info != NULL)
*info = siginfo;
return (ret);
}
int
__sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout)
{
struct pthread *curthread = _get_curthread();
int ret;
_thr_cancel_enter(curthread);
ret = lib_sigtimedwait(set, info, timeout);
_thr_cancel_leave(curthread, 1);
return (ret);
}
int _sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout)
{
return lib_sigtimedwait(set, info, timeout);
}
int
__sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
struct pthread *curthread = _get_curthread();
int ret;
_thr_cancel_enter(curthread);
ret = lib_sigtimedwait(set, info, NULL);
_thr_cancel_leave(curthread, 1);
return (ret);
}
int
_sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
return lib_sigtimedwait(set, info, NULL);
}
int
__sigwait(const sigset_t *set, int *sig)
{
struct pthread *curthread = _get_curthread();
int ret;
_thr_cancel_enter(curthread);
ret = lib_sigtimedwait(set, NULL, NULL);
if (ret > 0) {
*sig = ret;
ret = 0;
} else {
ret = errno;
}
_thr_cancel_leave(curthread, 1);
return (ret);
}
int
_sigwait(const sigset_t *set, int *sig)
{
int ret;
ret = lib_sigtimedwait(set, NULL, NULL);
if (ret > 0) {
*sig = ret;
ret = 0;
} else {
ret = errno;
}
return (ret);
}